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이두진,김명욱,김성륜,Seung Hwan Lee,윤재륜 한국유변학회 2010 Korea-Australia rheology journal Vol.22 No.2
Fiber orientation and micromechanics should be understood for exact prediction of physical properties and deformation of anisotropic composite parts which are generally treated as homogeneous materials for flow simulation and transversely isotropic materials for structural analyses. Fiber orientation has a significant effect on the mechanical properties and final shape of injection-molded parts. Fiber orientations in glass fiber (GF) reinforced PBT composites were observed by using a microtomography (Micro-CT) and the three dimensional CT results agreed with the prediction. Mechanical properties of the anisotropic composites were estimated by coupled three dimensional flow and structural analyses in which the micromechanics and the fiber orientation were considered spontaneously. In order to verify the coupled FE simulation results a theoretical model and a simple Representative Volume Element (RVE) model were employed. The coupled 3D analyses were in good agreement with the experimental data and the simple RVE model predicted higher stiffness than the experiments but lower stiffness than theoretical upper bound.
이두진,정우강,김환,이만재 대한산부인과학회 1993 Obstetrics & Gynecology Science Vol.36 No.4
1986년1월부터 1990년 12월까지 만 5년간 대전을지병원 산부인과에서 입원분만한 3,384예 중 임신 20주이후에 태아의 체중이 500gm이상인 자궁내 태아사망 108예의 임상기록을 기초 로 관찰분석하여 다음과 같은 결론을 얻었다. 1. 자궁내 태아사망의 발생빈도는 3.19%였다. 2. 연령분포는 20세에서 39세가지의 분포를 보였으며 그중 25~29세군이 51.8%로 가장 많았다. 3. 임신력은 초임부에서 58.3%로 가장 많았고, 자연유산의 기왕력은 10.2%에서 있었다. 4. 자궁내 태아사망의 기왕력이 있었던 경우는 8.3%였다. 5. 혈액형은 A형 Rh양성이 36.1%로 가장 많았다. 6. 임신주수별 분포는 25~28주에서 22.2%로 가장 많았다. 7. 태위는 두위가 80.6%로 가장 많았고, 남아와 여아의 비는 1.35:1이었으며, 78%에서 태아체 중이 2500gm이하였다. 8. 분만방법은 유도분만이 74.1%로 가장 많았고, 수술적 분만이 13.9%, 자연분만이 12.0%였다. 9. 자궁내 태아사망의 원인은 원인불명이 41.7%로 가장 많았다. 10. 모성합병증은 25.9%에서 나타났고, 이중 출혈이 53.6%로 가장 많았다. 11. 2회이상 산전관리 경험이 있는 예는 95.4%였다. 12. 혈소판 수가 50,000~100,000/mm3으로 감소한 경우가 7.1%였고 부분 트롬보 프라스틴 시간이 50초이상으로 연장되었던 경우가 1예있었다. 혈장섬유소원치가 150mg/dl이 하인 경우는 5.5%였고, FDPs가 40㎍/ml이상으로 증가한 경우가 12.5%였다. A clinical analysis of 108 cases of FDIU among 3384 deliveres at Daejeon Eulgi Hospital during 5 years from, January 1986 to December 1990 was made. The incidence of FDIU was 3.19%, the age distribution of mother with FDIU was 20 to 39 years old, and the highest group was 25 to 29 years old age group (51.8%). The parity of mother with FDIU was most highest in nulliparous group (58.3%), and there were 11 cases (10.2%) with previous history of spontaneous abortion, only 8.3% of FDIU cases had previous history of FDIU. The most common blood type was Rh positive A type(36.1%). The most common gestational weeks when FDIU was detected, was 25 to 28 weeks gestation period (22.2%). The most common presentation was cephalic (80.6%), and the sex ratio of male versus female fetus was 1.35:1, and 78% of FDIU weighing less than 2500gm. The mode of delivery for FDIU was induced labor (74.1%), spontaneous delivery (12%), and laparotomy (13.9%). The causes of FDIU were unexplained cases (41.7%), followed chorioamnionitis (12.0%), preeclampsia (10.2%), congenital anomaly (6.5%), maternal illness (5.6%), placental abruption (4.6%), placenta previa (3.7%), syphilis (2.8%), uterine rupture (1.9%), and trauma (0.9%). There were 28 cases (25.9%) of maternal complication, and the most common complication was hemorrhage (53.6%). The mother who had received antenatal care over 2 times were 95.4% of the cases, even without adequacy in its quality. In the incidence of abnormal coaulation test, the low platelet count (50,000~100, 000/mm3) was 7.1%, the prolonged partial thromboplastine time ($gt;50 sec.) was 1.4%, the hypofibrinogenemia ($lt; 150mg/dl) was 5.55%, and the elevated fibrinogen degradation products ($gt;40㎍/ml) was 12.5%. The incidence of FDIU by early detection during prenatal care of the risk factors related to FDIU. Early diagnosis and early treatment must be given to prevent maternal complications.